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From: Andrei Kolu <antik@bsd.ee>
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Date: Sat, 7 Apr 2007 17:39:34 +0300
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Subject: Re: ZFS committed to the FreeBSD base.
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On Saturday 07 April 2007 16:59, Florian C. Smeets wrote:
> Pawel Jakub Dawidek wrote:
> > On Sat, Apr 07, 2007 at 04:56:45AM +0200, Bernd Walter wrote:
> >> My sandbox just has 128MB RAM so kmem was set to ~40M.
> >> After raising kmem to 80M it survived copying the file, but paniced
> >> again while tar -xvzf the file into the same pool.
> >> vfs.zfs.vdev.cache.size is unchanged at 10M.
> >
> > 128MB RAM of suggested minimum in ZFS requirements, but it may be not
> > enough... Minimum of ARC is set to 1/8 of all memory or 64MB (whichever
> > is more). Could you locate these lines in
> > sys/contrib/opensolaris/uts/common/fs/zfs/arc.c file:
> >
> > 	/* set min cache to 1/32 of all memory, or 64MB, whichever is more */
> > 	arc_c_min = MAX(arc_c / 4, 64<<20);
> >
> > Change 64 to eg. 32, recompile and retest?
>
> Hi Pawel,
>
> i had the same problems like Bernd while trying to copy the src tree to
> a ZFS volume. I have 384MB RAM but i got the same "kmem_map: too small"
> panic. I compiled my kernel like you proposed and now i am able to copy
> anything to the volume without panic :-)
>
Why we can't use virtual memory?